AJAX :: Replacing The Submit Button Of A Rating Control Inside A Listview After A Vote

I have this working except for one thing. After the user has voted I want to replace the submit with "Thank you" text.

In the aspx page I have a label that is not visible, with the text = "NotVoted". This label is not in the listview. In the listview I have a label that is not visible and a button that is. The rating control is called vidRating. In the vidRating_Changed event I have

lblVoteStatus.Text = "Voted"
ListView1.DataBind()
In the ListView1_ItemDataBound event I have
Dim lblVoted As Label = CType(e.Item.FindControl("lblVoted"), Label)
Dim btnSubmit As Button = CType(e.Item.FindControl("btnSubmit"), Button)
If lblVoteStatus.Text = "Voted" Then
btnSubmit.Text = "Thank you"
btnSubmit.Visible = False
lblVoted.Visible = True
End If

When I run this in debug mode, if the user has voted, ListView1.DataBind() is run, lblVoteStatus.text = "Voted", and the code in the IF statement is run. I get no errors, but the page doesn't change. I still see the button and I don't see the label text. If I comment out the if /end if statements, the page opens displaying the label text, not the submit button. So the controls are being found ok. What am I doing wrong? How can I disable or remove the submit button after the user votes?